Step 1: Preheat your oven to 375°F (190°C) and prepare your baking dish by greasing it lightly.

Step 2: Slice the tops off the bell peppers, remove the seeds and membranes, and set them aside.

Step 3: Heat olive oil in a skillet and sauté onion and garlic until fragrant and translucent.

Step 4: Add the ground turkey and cook thoroughly, breaking it apart with a wooden spoon until no longer pink.

Step 5: Add the chopped spinach and cook until wilted, about 2–3 minutes.

Step 6: Stir in rice or quinoa (if using), diced tomatoes, and all seasonings. Mix until evenly combined.

Step 7: Remove from heat and fold in shredded cheese.

Step 8: Stuff the mixture into each prepared bell pepper, pressing lightly to pack the filling.

Step 9: Arrange the peppers upright in the baking dish and pour a little water into the dish to keep them moist while baking.

Step 10: Cover with foil and bake for 30 minutes. Remove foil, sprinkle with extra cheese, and bake for 10 more minutes until golden and bubbly.